<div [formGroup]="parts" class="example-tel-input-container">
  <input class="example-tel-input-element" formControlName="area" size="3">
  <span class="example-tel-input-spacer">&ndash;</span>
  <input class="example-tel-input-element" formControlName="exchange" size="3">
  <span class="example-tel-input-spacer">&ndash;</span>
  <input class="example-tel-input-element" formControlName="subscriber" size="4">
</div>
